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Offshore-based AC/DC MMC hybrid current collection circuit and current collection method

A collector circuit, AC and DC technology, applied in the field of offshore AC-DC MMC hybrid collector circuit and collector, can solve the problems of unavoidable influence of different voltage levels of generator sets, reduce power generation efficiency, etc., to improve power generation efficiency, easy to use The effect of implementing, reducing losses and material loss

Inactive Publication Date: 2019-12-13
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For offshore AC-DC hybrid power collection, the existing schemes mainly have the following problems: 1) the influence between generator sets of different voltage levels cannot be avoided; power generation efficiency

Method used

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  • Offshore-based AC/DC MMC hybrid current collection circuit and current collection method
  • Offshore-based AC/DC MMC hybrid current collection circuit and current collection method
  • Offshore-based AC/DC MMC hybrid current collection circuit and current collection method

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Embodiment Construction

[0017] like figure 1 As shown, based on the offshore AC-DC MMC hybrid collector circuit, it includes a wind turbine, an MMC-based AC-DC converter, an AC transformer T, and a power grid. The wind turbine includes a high-voltage large-capacity generator W1 and a low-voltage small-capacity generator W2, wherein the voltage level of the high-voltage large-capacity generator W1 is 960V, and the voltage level of the low-voltage small-capacity generator W2 is 690V; the AC-DC converter includes a large-capacity AC-DC converter, a large-capacity DC converter, Small-capacity AC / DC converters and ultra-large-capacity DC converters, wherein the capacity of the large-capacity AC / DC converter (1) is [10MVA, 100MVA), and the capacity of the large-capacity DC / DC converter (1) is [10MVA, 100MVA), the capacity of the small-capacity AC / DC converter (2) is [1KVA, 10MVA), and the capacity of the super-large capacity DC / DC converter (2) is [100MVA, 500MVA ); each high-voltage large-capacity genera...

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Abstract

The invention discloses an offshore-based AC / DC MMC hybrid current collection circuit. Each high-voltage large-capacity generator is respectively connected with an AC transformer, and the other end ofthe AC transformer is connected with a large-capacity AC / DC converter to form a high-voltage AC current collection branch circuit; each low-voltage small-capacity generator is respectively connectedwith a small-capacity AC / DC converter, and the other end of the small-capacity AC / DC converter is connected and then connected with the large-capacity DC converter to form a low-voltage DC current collection branch circuit; the other end of the large-capacity AC / DC converter is connected with the other end of the large-capacity DC converter and then connected with a super-large-capacity DC converter, and the high-voltage current collection branch circuit and the low-voltage current collection branch circuit are connected to a DC power grid through the super-large-capacity DC converter. The invention also discloses a corresponding integration method. Generator sets of different voltage grades can be isolated, integrated power supply of the generator sets of different voltage grades is realized, losses and material losses in the power generation process are reduced, and the power generation efficiency is enhanced.

Description

technical field [0001] The invention belongs to the hybrid current collection technology, in particular to a hybrid current collection circuit and a current collection method based on a marine AC / DC MMC. Background technique [0002] Offshore wind turbines can provide a large amount of electricity to the grid, but different generators have different voltage levels. Generator sets of different voltage levels collect electricity and supply power separately, which will cause a large amount of power loss and material loss, while direct parallel collection and power supply will not only damage the generator, but also cause the power grid to be paralyzed, causing huge economic losses and accidents. Therefore, it is meaningful to design a suitable offshore AC-DC hybrid collector circuit and corresponding hybrid collector method for generator sets of different voltage levels. [0003] For offshore AC-DC hybrid power collection, the existing schemes mainly have the following problem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10
CPCH02J1/10Y02P80/30
Inventor 王谱宇方云龙张义会马建行王松孙晓蕾吴志卜京谢鸣宇刘鑫
Owner NANJING UNIV OF SCI & TECH
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